I've just installed the SB 3.02 for Linux in combination with Plesk.
All Cyrillic letters are displayed as question marks, "?". However in Plesk I can easily use russian names.
You can check component versions here
Please, advice.
Thanks for your answer,
I almost solved this problem.
I've found that all tables and db sitebuilder3 itself has latin1 conversion. I've changed it to utf8 and all newly inserted data displayed correctly.
The only place where it's not good - labels for languages, I did reinstall of language packs - but labels are still consist of "?".
here is part of sitebuilder3.locale table